/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * http://www.opensource.org/licenses/cddl1.php
 * See the License for the specific language governing
 * permissions and limitations under the License.
 */

/*
 * FormWriter.java
 *
 * Created on November 21, 2007, 11:28 AM
 *
 */

package com.tianji.jersey.resource;

import java.io.IOException;
import java.io.OutputStream;
import java.io.StringWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author tianji
 */
//@Produces("application/xml")
//@Provider
public class XmlWriter implements MessageBodyWriter<Object> {
	private Log log = LogFactory.getLog(this.getClass());
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
    	log.debug("xml isWriteable==================");
    	return false;
//        return Object.class.isAssignableFrom(type);
    }

    public long getSize(Object data, Class<?> type, Type genericType, Annotation annotations[], MediaType mediaType) {
    	log.debug("xml getSize==================");
        return -1;
    }

    public void writeTo(Object object, 
            Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> headers, 
            OutputStream out) throws IOException {
    	
    	 String result = marshal(object);
//    	String contextPath = object.getClass().getPackage().getName();
//    	 log.debug("result=======================>"+object+"---->"+contextPath);
    	 log.debug("xml=======================>"+result);
    	 out.write(result.getBytes());
        
    }
    public String marshal(Object object) {
		if (object == null) {
			return null;
		}
		String contextPath = object.getClass().getPackage().getName();
		
		try {
			JAXBContext context = JAXBContext.newInstance(contextPath);
			Marshaller marshaller = context.createMarshaller();
			StringWriter sw = new StringWriter();
			marshaller.marshal(object, sw);
			sw.close();
			return sw.toString();
		} catch (JAXBException e) {
			if (log.isErrorEnabled()) {
				log.error("JAXBException, " + e);
			}
		} catch (IOException e) {
			if (log.isErrorEnabled()) {
				log.error("IOException, " + e);
			}
		}
		return null;
	}
    
   
}
